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// ==================================================
// - File______: ce241-fall08-hw5-q1.cpp ____________
// - Author____: Ahmet Ardal ________________________
// - Contact___: ardalahmet@hotmail.com _____________
// - Date______: 21/11/2008 _________________________
// __________________________________________________
// - Copyright (c) 2008, Some Rights Reserved _______
// ==================================================

#include <iostream>

using namespace std;

// symbolic constants
const int N_COURSES = 4;
const int N_EXAMS   = 3;

// function declarations
void calculateAverages(const int grades[][N_EXAMS], double *pAverages, int nCourses);

int main()
{
    double averages[N_COURSES];
    int gradesTable[N_COURSES][N_EXAMS] =
    {
        {60, 70, 80},
        {70, 80, 90},
        {80, 90, 95},
        {50, 60, 70}
    };

    // calculate averages
    calculateAverages(gradesTable, averages, N_COURSES);

    // print calculated averages
    for (int i = 0; i < N_COURSES; ++i)
    {
        cout << "Average for Course-" << (i + 1) << ": " << averages[i] << endl;
    }

    return 0;
}

// function definitions
void calculateAverages(const int grades[][N_EXAMS], double *pAverages, int nCourses)
{
    int tmpSum;

    // traverse rows as courses
    for (int i = 0; i < nCourses; ++i)
    {
        tmpSum = 0;

        // calculate sum of exam grades for ith course
        for (int k = 0; k < N_EXAMS; ++k)
        {
            tmpSum += grades[i][k];
        }

        // calculate average of exam grades for ith course
        pAverages[i] = (double) tmpSum / N_EXAMS;
    }
}

// ==================================================
// - File______: ce241-fall08-hw5-q2.cpp ____________
// - Author____: Ahmet Ardal ________________________
// - Contact___: ardalahmet@hotmail.com _____________
// - Date______: 21/11/2008 _________________________
// __________________________________________________
// - Copyright (c) 2008, Some Rights Reserved _______
// ==================================================

#include <iostream>

using namespace std;

// function declarations
int stringLength(const char *str);

int main()
{
    const char *strName = "Ali_Veli";

    cout << "stringLength(" << strName << ") = " << stringLength(strName) << endl;

    return 0;
}

// function definitions
int stringLength(const char *str)
{
    int count = 0;

    // count characters until null character
    //while (*str++)
    //{
    //    ++count;
    //}

    // count characters until null character
    //while (*str)
    //{
    //    ++str;
    //    ++count;
    //}

    // count characters until null character
    //while (*str++ != '\0')
    //{
    //    ++count;
    //}

    // count characters until null character
    while (*str != '\0')
    {
        ++str;
        ++count;
    }

    return count;
}

// ==================================================
// - File______: ce241-fall08-hw5-q3.cpp ____________
// - Author____: Ahmet Ardal ________________________
// - Contact___: ardalahmet@hotmail.com _____________
// - Date______: 21/11/2008 _________________________
// __________________________________________________
// - Copyright (c) 2008, Some Rights Reserved _______
// ==================================================

#include <iostream>
#include <cstring>

using namespace std;

// function declarations
bool isPalindromeRec(const char *str, int leftIdx, int rightIdx);

int main()
{
    const char *strPal = "desserts | stressed";

    if (isPalindromeRec(strPal, 0, (strlen(strPal) - 1)))
    {
        cout << "'" << strPal << "' is a palindrome...";
    }
    else
    {
        cout << "'" << strPal << "' is not a palindrome...";
    }

    cout << endl;

    return 0;
}

// function definitions
bool isPalindromeRec(const char *str, int leftIdx, int rightIdx)
{
    // base case
    if (leftIdx > rightIdx)
    {
        return true;
    }

    // general case
    if (str[leftIdx] == str[rightIdx])
    {
        return isPalindromeRec(str, (leftIdx + 1), (rightIdx - 1));
    }

    return false;
}

// ==================================================
// - File______: ce241-fall08-hw5-q4.cpp ____________
// - Author____: Ahmet Ardal ________________________
// - Contact___: ardalahmet@hotmail.com _____________
// - Date______: 21/11/2008 _________________________
// __________________________________________________
// - Copyright (c) 2008, Some Rights Reserved _______
// ==================================================

#include <iostream>

using namespace std;

// function declarations
void strCopyReplace(const char *src, char *dest, char oldChar, char newChar);

int main()
{
    const char *strSrc = "ankara_adana";
    char strDest[20];

    strCopyReplace(strSrc, strDest, 'a', 'X');

    cout << "Original string: " << strSrc << endl;
    cout << "Modified string: " << strDest << endl;

    return 0;
}

// function definitions
void strCopyReplace(const char *src, char *dest, char oldChar, char newChar)
{
    int i;

    // copy the string from src to dest
    for (i = 0; src[i] != '\0'; ++i)
    {
        // if current character is oldChar then copy newChar instead of it,
        // otherwise just copy it.
        if (src[i] == oldChar)
        {
            dest[i] = newChar;
        }
        else
        {
            dest[i] = src[i];
        }
    }

    // put the null character to mark the end of the string
    dest[i] = '\0';
}